linux-kernel - Re: [PATCH v8 03/13] KVM: arm64: PMU: Add a helper to read a vCPU's PMCR

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Message-ID: <07c09e70-a337-aa41-f022-7ea43be2c0c0@redhat.com>
Date:   Mon, 23 Oct 2023 18:18:32 +0200 (CEST)
From:   Sebastian Ott <sebott@...hat.com>
To:     Raghavendra Rao Ananta <rananta@...gle.com>
cc:     Oliver Upton <oliver.upton@...ux.dev>,
        Marc Zyngier <maz@...nel.org>,
        Alexandru Elisei <alexandru.elisei@....com>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Shaoqin Huang <shahuang@...hat.com>,
        Jing Zhang <jingzhangos@...gle.com>,
        Reiji Watanabe <reijiw@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Eric Auger <eric.auger@...hat.com>
Subject: Re: [PATCH v8 03/13] KVM: arm64: PMU: Add a helper to read a vCPU's
 PMCR_EL0

On Fri, 20 Oct 2023, Raghavendra Rao Ananta wrote:
> From: Reiji Watanabe <reijiw@...gle.com>
>
> Add a helper to read a vCPU's PMCR_EL0, and use it whenever KVM
> reads a vCPU's PMCR_EL0.
>
> Currently, the PMCR_EL0 value is tracked per vCPU. The following
> patches will make (only) PMCR_EL0.N track per guest. Having the
> new helper will be useful to combine the PMCR_EL0.N field
> (tracked per guest) and the other fields (tracked per vCPU)
> to provide the value of PMCR_EL0.
>
> No functional change intended.
>
> Signed-off-by: Reiji Watanabe <reijiw@...gle.com>
> Signed-off-by: Raghavendra Rao Ananta <rananta@...gle.com>
> Reviewed-by: Eric Auger <eric.auger@...hat.com>

Reviewed-by: Sebastian Ott <sebott@...hat.com>